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The Belgian, who has spent the last three seasons on loan at Atletico Madrid, surprisingly dislodged Petr Cech from the number one spot upon his return to London this summer and after Sunday’s performance, Shaw thinks it is easy to see why.

“We’ve seen what Courtois has done in the past six months, not just for Chelsea but before that (with Atletico) so we know what his qualities are and he’s proved to be a great buy for them,” the United left-back said.

“We had a lot of chances and, with him in goal, he helped them a lot. Robin had a few and I think it might have been Adnan (Januzaj) who had a shot as well.

“There were those chances but he’s a world-class goalie in their goal and he helped them a lot.”

Courtois was impressed by United’s attacking play and one player in particular caught his eye – Belgium team-mate Marouane Fellaini.

Fellaini caused the Chelsea defence problems with his height throughout and he could have bagged a couple of goals had he taken his chances.

The midfielder came in for criticism last season for a number of lacklustre displays following his £27.5million move from Everton.

The fact that he did not score his first United goal until last week’s draw at West Brom shows just how much of a flop his debut year at Old Trafford was.

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Courtois understands why United fans got on Fellaini’s back, but he has backed the former Everton man to win them over.

“It’s normal for some fans to act that way when someone costs a lot of money and is not playing well,” the Chelsea goalkeeper said.

“It’s easy to criticise them. That happens not just with him but other players.

“Obviously last season was not the easiest. The team was not doing very well and he’s not the kind of player to change the dynamic of the team, but he is an important player – he is very strong in the air when you play long balls to him.

“In the game against West Brom, he made an important goal for United and was very dangerous against us too.

“He is a good player and to have him with me in the Belgium team is very good.”